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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | //This file is automatically rebuilt by the Cesium build process.
export default "/**\n\
* Adjusts the saturation of a color.\n\
* \n\
* @name czm_saturation\n\
* @glslFunction\n\
* \n\
* @param {vec3} rgb The color.\n\
* @param {float} adjustment The amount to adjust the saturation of the color.\n\
*\n\
* @returns {float} The color with the saturation adjusted.\n\
*\n\
* @example\n\
* vec3 greyScale = czm_saturation(color, 0.0);\n\
* vec3 doubleSaturation = czm_saturation(color, 2.0);\n\
*/\n\
vec3 czm_saturation(vec3 rgb, float adjustment)\n\
{\n\
// Algorithm from Chapter 16 of OpenGL Shading Language\n\
const vec3 W = vec3(0.2125, 0.7154, 0.0721);\n\
vec3 intensity = vec3(dot(rgb, W));\n\
return mix(intensity, rgb, adjustment);\n\
}\n\
";
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